Elsa is Annabeths cousin and she is the doughter of Arens she is more powerful than all the gods,even The big 4 =Arens god of the moon and stars,Zeus,Poseidon and Hades all together but she dosnt know about it when she gets to the half blood camp everyone knows her and she is popular and thats how she meets = Percy Jackson(Jack Frost ) son of Poseidon,Merida Donbrch doughter of Ares the god of war,Rapunzel De Corona daughter of Aphrodite,Hiccup Haddock son of Didonysus, and Gover. Hope you enjoy